Everyone going in to Unstoppable should know that the title refers to Denzel Washington and Chris Pine and not to any silly ol' train.
That said, Unstoppable is a nearly perfect piece of mid-winter entertainment. Honestly, I can't think of all that many better ways to spend $85 million. I'm glad that someone is still making smart action thrillers like this in Hollywood. Movies like this are few and far between.
As an old fuddy-duddy father, I only wish that they had eased off on the four-letter words. This could have been a thoroughly appropriate family adventure, which is a rare thing these days.